Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Thanks for the replies. The engine I am building is double acting and reversing. I have thought it over, after reading the replies to this post, and I think I understand the placement of the ports. Basically, they are at the ends of the travel. As far as the cylinder travels in its "wobble " motion. This makes sense when I think about the reversing. If they were any place else, the timing might be good in one direction but bad in the other rotation. Now I have to figure out how to balance the crankshaft.  I will post some pictures of what I have so far as soon as time allows.